[tokenizers] support stride in tokenizers #2006
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Description
This PR adds support for utilizing the stride parameter in truncation. Users can now pass in the stride value and get the overflowing encodings. See #1996
One thought I had is whether we should add a flag to the tokenizer that indicates whether a user wants overflows returned. I'm not sure how often these overflows are used in practice, but I imagine there are cases where tokenization results in overflow but the user doesn't care about them. We could avoid JNI calls in these situations by adding a flag.